EP0710962A1 - Flammwidriges Kabel zur Verwendung in einem Kabelnetz - Google Patents

Flammwidriges Kabel zur Verwendung in einem Kabelnetz Download PDF

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Publication number
EP0710962A1
EP0710962A1 EP95307545A EP95307545A EP0710962A1 EP 0710962 A1 EP0710962 A1 EP 0710962A1 EP 95307545 A EP95307545 A EP 95307545A EP 95307545 A EP95307545 A EP 95307545A EP 0710962 A1 EP0710962 A1 EP 0710962A1
Authority
EP
European Patent Office
Prior art keywords
cable
percent
twenty
approximately
groups
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95307545A
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English (en)
French (fr)
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EP0710962B1 (de
Inventor
Larry L. Bleich
Stephen T. Zerbs
Warren F. Moore
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AT&T Corp
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AT&T Corp
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Filing date
Publication date
Application filed by AT&T Corp filed Critical AT&T Corp
Publication of EP0710962A1 publication Critical patent/EP0710962A1/de
Application granted granted Critical
Publication of EP0710962B1 publication Critical patent/EP0710962B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00Communication cables or conductors
    • H01B11/02Cables with twisted pairs or quads
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29Protection against damage caused by extremes of temperature or by flame
    • H01B7/295Protection against damage caused by extremes of temperature or by flame using material resistant to flame

Definitions

  • This invention relates to fire resistant multi-pair telecommunications cables (backbone cables) for transmitting high frequency signals and, more particularly, to such a cable for use in local area network riser cable applications for transmitting digital signals without degradation thereof.
  • riser cable The danger of the spread of fire is compounded in those case where the cable extends from floor to floor, in which case it is referred to as a riser cable.
  • This cable is often extended upward or downward for more than two stories, therefore, Underwriters Laboratories performs stringent tests to verify that the cable will perform satisfactorily.
  • the UL Test 1666 known as a vertical tray test is used by Underwriters Laboratories to determine whether a cable is acceptable as a riser cable.
  • a sample of cable is extended upward from a first floor along a ladder arrangement having spaced rungs.
  • the maximum continuous damage height to the cable is then measured. If the damage height to the cable does not equal or exceed twelve feet, the cable is given a CMR rating approval for use as a riser cable.
  • U.S. Patent 5,074,640 of Hardin et al. there is disclosed a cable for use in plenums or riser shafts, in which the individual conductors are insulated by a non-halogenated plastic composition which includes a polyetherimide constituent and an additive system.
  • the jacket includes a siloxane/polyimide copolymer constituent blended with a polyetherimide constituent and an additive system, including a flame retardant system.
  • U.S. Patent 4,412,094 of Dougherty et al. a riser cable is disclosed wherein each of the conductors is surrounded by two layers of insulation.
  • the inner layer is a polyolefin plastic material expanded to a predetermined percentage, and the outer layer comprises a relatively fire retardant material.
  • the core is enclosed in a metallic jacket and a fire resistant material.
  • Such a cable also meets the requirements for fire resistance and low smoke.
  • the metallic jacket represents an added cost element in the production of the cable.
  • U.S. Patent 5,162,609 of Adriaenssens et al. there is shown a fire resistant cable in which the metallic jacket member is eliminated.
  • each conductor of the several pairs of conductors has a metallic, i.e., copper center member surrounded by an insulating layer of solid, low density polyethylene which is, in turn, surrounded by a flame resistant polyethylene material.
  • the core i.e., all of the insulated conductors, is surrounded by a jacket of flame retardant polyethylene.
  • Such a structure meets the criteria for use in buildings and is, apparently, widely used.
  • a cable for interior use should, desirably, provide substantially error free transmission at very high frequencies.
  • the satisfactory achievement of such transmission has not been fully realized because of a problem with most twisted pair and coaxial cables which, while not serious at low transmission frequencies, becomes acute at the high frequencies associated with transmission at high bit rates.
  • This problem is identified and known as structural return loss (SRL), which is defined as signal attenuation resulting from periodic variations in impedance along the cable. SRL is affected by the structure of the cable and the various cable components, which cause signal reflections.
  • Such signal reflections can cause transmitted or received signal loss, fluctuations with frequency of the received signals, distortion of transmitted or received pulses, increased noise at carrier frequencies and, to some extent, will place an upper signal frequency limit on twisted pair cables.
  • Some of the structural defects that cause SRL are conductors which fluctuate in diameter along their length. or where, for whatever reason, the surface of the wire is rough or uneven. Insulation roughness or irregularities, excessive eccentricity, as well as variations in insulation diameter, may likewise increase SRL.
  • the problem of achieving uniformity of insulation is compounded because of the difficulty of forming a first layer that is substantially uniform and then forming a second, substantially uniform layer over the first. If the first layer is soft or compressible, the second layer can distort it, thereby increasing SRL to an undesirable level. If, in turn, the second layer is compressible, it can be distorted by the helical member used to bundle the cable pairs, or during the twisting process. Should the conductors of a twisted pair have varying spacing along their length, SRL can be undesirably increased. The presence of metallic shielding members or sleeves can also lead to undesirable increases in SRL.
  • the cable For a Category V cable, which is the highest category, i.e., the category wherein the cable is capable of handling signals up to 100 MHz, the cable must meet the UL designated EIA/TIA 568 standard rating Proposal 2840 which involves attenuation, impedance, cross-talk, and SRL.
  • the SRL In dB, should be, at 20 MHz, 23 dB or more.
  • the allowable SRL is determined by where SRL200 is the SRL at 20 MHz and f is the frequency. It should be understood that the measured SRL is given by dB below signal and hence, in actuality, is a negative figure.
  • SRL margin The difference between the required or allowable SRL and the measured SRL is known as SRL margin. Therefore, the greater the SRL margin of a cable, the better the performance thereof. It can thus be appreciated that the necessity for flame retardance or fire resistance, especially in riser cables, and the desirable end of minimizing SRL, resulting in unimpaired signal transmission, are not amenable to a simple solution.
  • the achievement of a high level of flame retardance by the prior art methods as noted in the foregoing can, and most often does, lead to increased SRL, as does the presence of metallic sleeves or the like. While it is by no means impossible to achieve good SRL characteristics with some of the prior art flame retardant riser cables, the cost involved in assuring uniformity of the various conductors and double insulation layers, while not prohibitive, can be substantially more than is economically feasible.
  • a cable suitable for riser installations comprises twenty-five twisted pairs arranged in what is known in the art as "honeycomb" structure.
  • the principles of the invention are applicable to a range of twisted pair cables, from six twisted pairs to one hundred or more twisted pairs.
  • Each conductor of each pair comprises a central metallic conducting member encased in an insulating layer of non-flame retardant polyolefin composition, such as high density polyethylene (HDPE).
  • HDPE high density polyethylene
  • Polyolefins unless specifically compounded for flame retardance, are highly flammable materials hence the core formed by the several conductors is surrounded by a jacket of highly flame retardant poly(vinyl chloride) (PVC) material.
  • the jacket is comprises of forty-five to fifty percent (45-50%) GP-4 PVC resin; four to six percent (4-6%) stabilizers including three to four percent (3-4%) tribasic lead sulfate; one to two percent (1-2%) lubricants including Henkel G-16 and Henkel G-71; twenty to twenty-four percent (20-24%) plasticizers including up to five percent (5%) 711 phthalate, eleven to thirteen percent (11-13%) tetra-brominated di-2-ethyl-hexyl phthalate, and four to six percent (4-6%) mixed phosphate ester such as Morrsanto Santicizer 2248; and twenty to twenty-two percent (20-22%) flame retardants including alumina trihydrate and antimony trioxide.
  • the cable embodying the principles and features of the invention meets the flame retardant requirements for riser cables, but equally as important, gives greater than five dB improvement in SRL margin, without adversely impacting other electrical characteristics. Further, experience has shown that cables manufactured with the prior art have a strong tendency to fail SRL requirements, negatively affecting manufacturing economics. In contrast, cable manufactured with the principles of the invention has exhibited the potential for a ten-fold improvement in SRL failure rate, with an improved SRL margin at all frequencies of use.
  • FIG. 1 is a cross-sectional view of the cable of the present invention.
  • FIG. 2 is a table (Table I) comparing certain aspects of the performance of the cable of the invention to those of presently used standard cable.
  • cable 11 of Fig. 1 comprises seven groups 12, 13, 14, 16, 17, 18 and 19 of twisted-pairs, outlined in dashed lines, each pair of insulated conductors being identified by the reference numeral 21 inasmuch as all of the pairs are identical except for color and twist length.
  • Groups 12, 14, 17 and 19 have four pairs each and groups 13, 16 and 18 have three pairs each.
  • the twist length of the pairs differs in order to minimize cross-talk, or inter-pair noise.
  • each of the groups has a helical twist, and the lay of the groups differs, being 3.6 in group 12, 4.3 in group 13, 3.2 in group 14, 3.7 in group 16, 3.2 in group 18, and 2.5 in group 19.
  • the different groups especially those immediately adjacent to each other, should have different lays for best overall performance.
  • the six groups are, in turn, twisted and may be held together by a cable binder such as nylon yarn 22, wound helically about the center of the group.
  • the core thus formed is enclosed within a jacket 23, and the entire assembly is referred to in the art as a "honeycomb" structure.
  • each conductor 24 of a twisted pair 21 is encased within an insulating sheath 26 of a polyolefin material such as high density polyethylene (HDPE).
  • HDPE is a relatively tough dielectric material that can be uniformly extruded with a smooth outer surface, a relatively uniform thickness, and adhesion to the conductor 24 that is within allowable limits.
  • the single layer 26 of insulation results in an insulated conductor that is slightly smaller in overall diameter, and with less eccentricity, than the dual layers of insulation in the prior art, thereby enabling somewhat smaller cables of equal capacity. Further, inasmuch as fire retarding the insulation material is not necessary in the cable of the invention, the insulation better resists distortion during the various manufacturing operations, thereby minimizing SRL.
  • HDPE is a very flammable material and the practice in the prior art has been to use a treated insulating material or an insulating material that is normally fire retardant or, as pointed out in the foregoing, a composite inulation consisting of a minimum of two layers, at least one of which is fire retardant.
  • a treated insulating material or an insulating material that is normally fire retardant or, as pointed out in the foregoing, a composite inulation consisting of a minimum of two layers, at least one of which is fire retardant.
  • SRL often exceeding ten percent (10%) of cable production.
  • the manufacture of such cables is not as economical as is to be desired.
  • the cable of the invention as depicted in Fig. 1, be suitable for use as a riser cable, it is necessary that the outer jacket 23 be highly fire retardant.
  • jacket 23 comprises a mixture of PVC material and other ingredients which render it highly flame retardant. It has been found that a mixture comprising one hundred parts by weight per hundred parts resin (PHR) or fifty percent (50%) GP-4 PVC resin; ten and one-half PHR or five and two-tenths percent (5.2%) stabilizers which includes approximately seven PHR or three and one-half percent (3.5%) tribasic lead sulfate; approximately three PHR or one and one-half percent (1.5%) lubricants including Henkel G-16 and Henkel G-71, which are commercially available; approximately forty-four PHR or twenty-two percent (22%) plasticizers including approximately ten PHR or five percent (5%) 711 phthalate, twenty-four PHR or approximately twelve percent (12%) tetra-brominated di-2-ethyl-hexyl phthalate, and approximately ten PHR or five percent (5%) mixed phosphate ester such as Morrsanto Santicizer 2248; and approximately
  • Table I compares the SRL margin, as measured by tests, for a standard, dual-insulated cable, with that of the cable of the invention as depicted in Fig. 1, measured over a frequency range of 0.1 to 125 MHz.
  • the maximum permitted SRL value is 23 dB from 1-20 KHz, and is calculated at frequencies greater than 20 MHz by Equation (1).
  • the frequency range was divided into four segments as shown, and the numbers are the measured SRL margin.
  • the figure of 9.4 in segment 4 indicates that the measured SRL was 9.4 dB less than the maximum allowable.
  • the cable of the invention as tested had twenty-five twisted pairs with a conductor gauge of from 18 to 28 AWG, and insulation thickness of less than twelve mils (0.012 inches) and a jacket wall thickness of 21 mils (0.021 inches) at any point.
  • the cable of the invention exhibits greatly improved SRL margin.
  • the comparative performance of the two cables in segment 4 which represents the high end of the frequency spectrum used, and is the frequency range employed in data transmission, where SRL has its most deleterious effects.
  • the standard cable showed an SRL margin of only 0.1 dB, whereas the cable of the invention exhibited an SRL margin of 7.8 dB.
  • Maximum SRL margin for the standard cable, in segment 4, was measured at 9.4 dB and the maximum for the cable of the invention was 13.5 dB.
  • the average improvement in SRL for the cable of the invention was measured as approximately 5 dB better than the average for the standard cable. This is a remarkable improvement in SRL performance.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP95307545A 1994-11-04 1995-10-24 Flammwidriges Kabel zur Verwendung in einem Kabelnetz Expired - Lifetime EP0710962B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US334657 1994-11-04
US08/334,657 US5600097A (en) 1994-11-04 1994-11-04 Fire resistant cable for use in local area network

Publications (2)

Publication Number Publication Date
EP0710962A1 true EP0710962A1 (de) 1996-05-08
EP0710962B1 EP0710962B1 (de) 2004-09-29

Family

ID=23308191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95307545A Expired - Lifetime EP0710962B1 (de) 1994-11-04 1995-10-24 Flammwidriges Kabel zur Verwendung in einem Kabelnetz

Country Status (8)

Country Link
US (1) US5600097A (de)
EP (1) EP0710962B1 (de)
JP (1) JP3645337B2 (de)
KR (1) KR960019333A (de)
AT (1) ATE278245T1 (de)
AU (1) AU690749B2 (de)
CA (1) CA2158498C (de)
DE (1) DE69533571T2 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742565A2 (de) * 1995-05-12 1996-11-13 AT&T IPM Corp. Elektronikdraht und Kabel mit wenige Paaren
EP0768678A2 (de) * 1995-10-13 1997-04-16 AT&T Corp. Feuerfeste halogenfreie Steigleitung
EP0778589A3 (de) * 1995-12-08 1997-07-30 Alcatel Nachrichtenkabel für Plenum
EP2119786A1 (de) 2008-05-13 2009-11-18 Expressive Research B.V. Erhöhte Erzeugung von gesundheitsfördernden Zusammensetzungen in Pflanzen
EP2629309A3 (de) * 2012-02-16 2013-12-04 Nexans LAN-Kabel mit PVC-Kreuzzwickel

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US5739473A (en) * 1995-07-31 1998-04-14 Lucent Technologies Inc. Fire resistant cable for use in local area network
US6222130B1 (en) 1996-04-09 2001-04-24 Belden Wire & Cable Company High performance data cable
US6037546A (en) * 1996-04-30 2000-03-14 Belden Communications Company Single-jacketed plenum cable
US6392152B1 (en) * 1996-04-30 2002-05-21 Belden Communications Plenum cable
GB9707300D0 (en) * 1997-04-10 1997-05-28 Plastic Insulated Cables Ltd Communications cable
US6074503A (en) 1997-04-22 2000-06-13 Cable Design Technologies, Inc. Making enhanced data cable with cross-twist cabled core profile
CA2220368C (en) * 1997-05-15 2001-02-13 Cable Systems International, Inc. Single-jacketed plenum cable
US6140587A (en) * 1997-05-20 2000-10-31 Shaw Industries, Ltd. Twin axial electrical cable
US6211467B1 (en) * 1998-08-06 2001-04-03 Prestolite Wire Corporation Low loss data cable
US6096977A (en) * 1998-09-04 2000-08-01 Lucent Technologies Inc. High speed transmission patch cord cable
JP3636001B2 (ja) * 1999-09-27 2005-04-06 住友電装株式会社 ツイストペアケーブル
DE10162739A1 (de) * 2001-12-20 2003-07-03 Nexans Flexible elektrische Leitung
JP2004178838A (ja) * 2002-11-25 2004-06-24 Pioneer Electronic Corp 導線及びこれを用いたスピーカ
US7214884B2 (en) * 2003-10-31 2007-05-08 Adc Incorporated Cable with offset filler
US7537393B2 (en) 2005-06-08 2009-05-26 Commscope, Inc. Of North Carolina Connectorized fiber optic cabling and methods for forming the same
US7742667B2 (en) * 2005-06-08 2010-06-22 Commscope, Inc. Of North Carolina Fiber optic cables and methods for forming the same
US8992098B2 (en) 2005-06-08 2015-03-31 Commscope, Inc. Of North Carolina Methods for forming connectorized fiber optic cabling
US10578812B2 (en) 2005-06-08 2020-03-03 Commscope, Inc. Of North Carolina Methods for forming connectorized fiber optic cabling
US20100078196A1 (en) * 2007-12-19 2010-04-01 Mclaughlin Thomas Category cable using dissimilar solid multiple layer
JP5962960B2 (ja) * 2012-03-01 2016-08-03 株式会社ジェイテクト 電子ユニットの防水構造
EP2932509B1 (de) 2012-12-17 2016-11-30 3M Innovative Properties Company Flammhemmendes twin-axialkabel
JP6075490B1 (ja) 2016-03-31 2017-02-08 株式会社オートネットワーク技術研究所 通信用シールド電線
CN112599297B (zh) * 2016-03-31 2022-11-22 株式会社自动网络技术研究所 通信用电线
CN106128574A (zh) * 2016-07-25 2016-11-16 上海贝恩科电缆有限公司 一种薄壁轻型光电复合电梯随行电缆
KR102397541B1 (ko) 2018-03-15 2022-05-13 한국전자통신연구원 신호 전달용 전송 선로를 이용한 무선 통신 장치 및 무선 통신 방법
RU192507U1 (ru) * 2019-05-29 2019-09-18 АО "Кирскабель" Огнестойкий электрический кабель
JP2023069558A (ja) * 2021-11-05 2023-05-18 住友電気工業株式会社 太物電線

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DE2455780A1 (de) * 1974-11-26 1976-08-12 Standard Elektrik Lorenz Ag Schwerentflammbares schaltkabel mit verbesserten elektrischen eigenschaften
US4284842A (en) 1979-10-31 1981-08-18 Bell Telephone Laboratories, Inc. Cable having superior resistance to flame spread and smoke evolution
US4412094A (en) 1980-05-21 1983-10-25 Western Electric Company, Inc. Compositely insulated conductor riser cable
US4605818A (en) 1984-06-29 1986-08-12 At&T Technologies, Inc. Flame-resistant plenum cable and methods of making
US5074640A (en) 1990-12-14 1991-12-24 At&T Bell Laboratories Cables which include non-halogenated plastic materials
US5162609A (en) 1991-07-31 1992-11-10 At&T Bell Laboratories Fire-resistant cable for transmitting high frequency signals
US5173960A (en) * 1992-03-06 1992-12-22 At&T Bell Laboratories Cable having superior resistance to flame spread and smoke evolution

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742565A2 (de) * 1995-05-12 1996-11-13 AT&T IPM Corp. Elektronikdraht und Kabel mit wenige Paaren
EP0742565A3 (de) * 1995-05-12 1998-06-17 AT&T IPM Corp. Elektronikdraht und Kabel mit wenige Paaren
EP0768678A2 (de) * 1995-10-13 1997-04-16 AT&T Corp. Feuerfeste halogenfreie Steigleitung
EP0768678A3 (de) * 1995-10-13 1997-07-23 At & T Corp Feuerfeste halogenfreie Steigleitung
EP0778589A3 (de) * 1995-12-08 1997-07-30 Alcatel Nachrichtenkabel für Plenum
EP2119786A1 (de) 2008-05-13 2009-11-18 Expressive Research B.V. Erhöhte Erzeugung von gesundheitsfördernden Zusammensetzungen in Pflanzen
EP2629309A3 (de) * 2012-02-16 2013-12-04 Nexans LAN-Kabel mit PVC-Kreuzzwickel

Also Published As

Publication number Publication date
AU690749B2 (en) 1998-04-30
KR960019333A (ko) 1996-06-17
JP3645337B2 (ja) 2005-05-11
JPH08241631A (ja) 1996-09-17
CA2158498C (en) 1999-04-13
US5600097A (en) 1997-02-04
EP0710962B1 (de) 2004-09-29
ATE278245T1 (de) 2004-10-15
DE69533571D1 (de) 2004-11-04
AU3660195A (en) 1996-05-09
CA2158498A1 (en) 1996-05-05
DE69533571T2 (de) 2006-02-16

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